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DEFERRED INCOME TAX ASSETS/LIABILITIES - Maturities of estimated tax carryforward (Details) - ARS ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
DEFERRED INCOME TAX ASSETS/LIABILITIES    
Deferred tax assets $ 78.0 $ 66.0
Non-recoverable Tax carryforward amount 0.4  
Tax carryforward amount 9,554.0  
Tax Year 2015    
DEFERRED INCOME TAX ASSETS/LIABILITIES    
Tax carryforward amount 8.0  
Tax Year 2016    
DEFERRED INCOME TAX ASSETS/LIABILITIES    
Tax carryforward amount 1.0  
Tax Year 2017    
DEFERRED INCOME TAX ASSETS/LIABILITIES    
Tax carryforward amount 1.0  
Tax carryforward    
DEFERRED INCOME TAX ASSETS/LIABILITIES    
Deferred tax assets 2,866.0  
Telecom Argentina | Tax Year 2018    
DEFERRED INCOME TAX ASSETS/LIABILITIES    
Tax carryforward amount 9,540.0  
Inter Radios | Tax Year 2018    
DEFERRED INCOME TAX ASSETS/LIABILITIES    
Tax carryforward amount $ 4.0